BDOC NSS EXAM QUESTIONS |
GUARANTEED PASS!!
Major Lights - ACCURATE ANSWERS✔✔ a high intensity and
reliable light exhibited from a fixed structure or marine site
Primary Major Light - ACCURATE ANSWERS✔✔ Established for
making landfall from sea
Secondary Major Light - ACCURATE ANSWERS✔✔ Established at
harbor entrances
Minor Lights - ACCURATE ANSWERS✔✔ Low to moderate intensity
light used to mark a specific channel or location
Two considerations for minor lights - ACCURATE ANSWERS✔✔ o
Care should be taken NOT to confuse minor lights with lighted buoys
o Established in harbors, channels, rivers, and isolated locations
Sector Lights - ACCURATE ANSWERS✔✔ o Red: Danger Areas
o Green: Turning Points or best water areas
o White: Good water
Buoy Shapes - ACCURATE ANSWERS✔✔ Can, Nun, Pillar, Spar,
Sphere
,Purpose of Buoys - ACCURATE ANSWERS✔✔ Aids to navigation and
used to mark
o Channels
o Shoals
o Obstructions
o Warn of Dangers
IALA A - ACCURATE ANSWERS✔✔ Red port, Green Starboard when
returing to harbor (Countries in Africa, Asia, Australia, Europe)
IALA B - ACCURATE ANSWERS✔✔ Green port, Red Starboard when
returning to harbor (Countries like America, Japan, Korea, and the
Philippines)
Variation - ACCURATE ANSWERS✔✔ The angular difference
between the true meridian and the magnetic meridian
o True Bearing = Magnetic Bearing + Variation
Deviation - ACCURATE ANSWERS✔✔ The deflection right or left of
the magnetic meridian caused by magnetic properties of the vessel
Gyrocompass Error - ACCURATE ANSWERS✔✔ The difference
between the true heading and gyrocompass heading. Caused by: friction,
ship's motion, electronic malfunction, and power fluctuations
, Permenant Magnetism - ACCURATE ANSWERS✔✔ The stable
magnetic condition of the ship, created by construction and materials
used
Induced Magnetisim - ACCURATE ANSWERS✔✔ Magnetism
acquired by the ships placement in the earth's magnetic field
Datum - ACCURATE ANSWERS✔✔ The mathematical model of the
earth used to calculate position coordinates, heights, and distances
Datum used by US Navy - ACCURATE ANSWERS✔✔ WGS 84
(World Geodetic System 1984)
Three segments of GPS - ACCURATE ANSWERS✔✔ Control, User,
Space
FOM - ACCURATE ANSWERS✔✔ (Figure of Merit): An internal GPS
receiver calculation that indicated the best accuracy achievable from the
satellites being tracked
Chart - ACCURATE ANSWERS✔✔ Graphical representation of the
spherical Earth
Two types of chart projection used by US Navy - ACCURATE
ANSWERS✔✔ Mercator and Gnomic
GUARANTEED PASS!!
Major Lights - ACCURATE ANSWERS✔✔ a high intensity and
reliable light exhibited from a fixed structure or marine site
Primary Major Light - ACCURATE ANSWERS✔✔ Established for
making landfall from sea
Secondary Major Light - ACCURATE ANSWERS✔✔ Established at
harbor entrances
Minor Lights - ACCURATE ANSWERS✔✔ Low to moderate intensity
light used to mark a specific channel or location
Two considerations for minor lights - ACCURATE ANSWERS✔✔ o
Care should be taken NOT to confuse minor lights with lighted buoys
o Established in harbors, channels, rivers, and isolated locations
Sector Lights - ACCURATE ANSWERS✔✔ o Red: Danger Areas
o Green: Turning Points or best water areas
o White: Good water
Buoy Shapes - ACCURATE ANSWERS✔✔ Can, Nun, Pillar, Spar,
Sphere
,Purpose of Buoys - ACCURATE ANSWERS✔✔ Aids to navigation and
used to mark
o Channels
o Shoals
o Obstructions
o Warn of Dangers
IALA A - ACCURATE ANSWERS✔✔ Red port, Green Starboard when
returing to harbor (Countries in Africa, Asia, Australia, Europe)
IALA B - ACCURATE ANSWERS✔✔ Green port, Red Starboard when
returning to harbor (Countries like America, Japan, Korea, and the
Philippines)
Variation - ACCURATE ANSWERS✔✔ The angular difference
between the true meridian and the magnetic meridian
o True Bearing = Magnetic Bearing + Variation
Deviation - ACCURATE ANSWERS✔✔ The deflection right or left of
the magnetic meridian caused by magnetic properties of the vessel
Gyrocompass Error - ACCURATE ANSWERS✔✔ The difference
between the true heading and gyrocompass heading. Caused by: friction,
ship's motion, electronic malfunction, and power fluctuations
, Permenant Magnetism - ACCURATE ANSWERS✔✔ The stable
magnetic condition of the ship, created by construction and materials
used
Induced Magnetisim - ACCURATE ANSWERS✔✔ Magnetism
acquired by the ships placement in the earth's magnetic field
Datum - ACCURATE ANSWERS✔✔ The mathematical model of the
earth used to calculate position coordinates, heights, and distances
Datum used by US Navy - ACCURATE ANSWERS✔✔ WGS 84
(World Geodetic System 1984)
Three segments of GPS - ACCURATE ANSWERS✔✔ Control, User,
Space
FOM - ACCURATE ANSWERS✔✔ (Figure of Merit): An internal GPS
receiver calculation that indicated the best accuracy achievable from the
satellites being tracked
Chart - ACCURATE ANSWERS✔✔ Graphical representation of the
spherical Earth
Two types of chart projection used by US Navy - ACCURATE
ANSWERS✔✔ Mercator and Gnomic
